Excellent, I feel like home, highly recommend. Just his guideline about Bangkok is not accurate, should update. From DongMuang Airport, we can still get to his hotel by public transport at 11h15 pm ( he said in the email that the public transport finishes at 10h or 10h30).

I think this information can be useful for s.o :) From the hotel, you can go to Grand Palace, Wat Pho, Khao San road by BUS 47, it is free bus but no air cond, I advise to take only in the morning and after 7pm to avoid traffic jam.
If you go to Grand Palace by motobike taxi, can deal 100baht/person.